Make FuzzedDataProvider vend std::strings

net/socket/fuzzed_socket.cc

Index: net/socket/fuzzed_socket.cc
diff --git a/net/socket/fuzzed_socket.cc b/net/socket/fuzzed_socket.cc
index 40c0adfee26fd03c424e728d4e16bac687e34830..d0b11cf68b7c60f6a98a374eaa17f16d384299fe 100644
--- a/net/socket/fuzzed_socket.cc
+++ b/net/socket/fuzzed_socket.cc
@@ -63,8 +63,8 @@ int FuzzedSocket::Read(IOBuffer* buf,
       result = buf_len;
 
     if (result > 0) {
-      base::StringPiece data = data_provider_->ConsumeBytes(result);
-      result = data.length();
+      std::string data = data_provider_->ConsumeBytes(result);
+      result = data.size();
       std::copy(data.data(), data.data() + result, buf->data());
     }